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3x2+4x5= 3x(2+4x5)= 3x(2+4)x5=3*6*5=18*5=90
2x12-8:4= 2x(12-8:4)= 2x(12-8):4=2*4:4=8:4=2
18-2x3+4= 18-(2x3+4)= 18-2x(3+4)=18-2*7=18-14=4